Prior to his admission, Armstrong either resigned or was dropped from the boards of various foundations. The US Anti-Doping Agency stripped him of his seven Tour de France titles and imposed a lifetime ban on him.

The International Cycling Union also stripped Armstrong of his Tour de France titles and banned him from professional cycling for life.

After his admission, the International Olympic Committee stripped Armstrong of the bronze medal he won at the 2000 Olympic Games in Sydney.

Olympic track star sentenced to prison

Marion Jones won five medals at the 2000 Olympics, including gold in the 100 meters, 200 meters and 1,600-meter relay, and bronze in the long jump and 400-meter relay.

But she later pleaded guilty to lying to federal agents about using performance-enhancing drugs. In 2007, after years of denials, Jones admitted she used the steroid THG, known as "the clear," from 1999 to 2001. She returned her five medals.

NBA ref took bets on games he officiated

NBA referee Tim Donaghy was a 13-year veteran in the league, making $260,000 annually, when he quit in 2007 amid accusations of betting on games.

Donaghy and two other men were involved in a gambling ring in which Donaghy was paid to provide winning picks based on classified information he received as a referee. Donaghy used code language to tip off the men, authorities said.

The former referee told a judge in 2008 that he got involved with the gambling ring to pay for his severe gambling addiction.

Donaghy was sentenced to 15 months in prison and three years of supervised release -- less than the maximum penalty of 33 months, or nearly three years, in prison.

The two men -- James Battista and Thomas Martino -- were sentenced to more than year in prison. They and Donaghy also agreed to pay the NBA more than $200,000 in restitution.

The NBA at the time denied that Donaghy's conduct was part of a larger problem within the league.

Ice skater's knee bludgeoned before Olympics

One of the biggest sports rivalries of the 1990s was between professional ice skaters Tonya Harding and Nancy Kerrigan.

Kerrigan recovered in time for the performance and went on to take silver.

NFL team punished in two scandals

The New England Patriots are no strangers to scandals.

In 2007, the Patriots were caught videotaping the New York Jets coaches' hand signals during a game in what became known as Spygate. NFL Commissioner Roger Goodell fined Patriots head coach Bill Belichick $500,000, while the team was fined $250,000 and lost a first-round draft pick.

Eight years later, the Patriots were involved in Deflategate. It was found that 11 of the 12 game balls the Patriots provided for the AFC Championship game were under-inflated by about 2 pounds per square inch each, which could make them easier to grip.

Quarterback Tom Brady was hit with a four-game suspension at the beginning of the 2016 season. The Patriots organization was fined $1 million and forfeited draft picks.

The team is currently under investigation after allegations they recorded the Cincinnati Bengals sideline during the team's game against the Cleveland Browns. The Patriots have said the video team was shooting a behind-the-scenes feature on the Patriots scouting staff.

Update: This article has been updated to reflect that Ruiz died in July.